VPD.to.rH {bigleaf}

Conversions between Humidity Measures

Description

Conversion between vapor pressure (e), vapor pressure deficit (VPD), specific humidity (q), and relative humidity (rH).

Usage

VPD.to.rH(
  VPD,
  Tair,
  Esat.formula = c("Sonntag_1990", "Alduchov_1996", "Allen_1998"),
  constants = bigleaf.constants()
)

rH.to.VPD(
  rH,
  Tair,
  Esat.formula = c("Sonntag_1990", "Alduchov_1996", "Allen_1998"),
  constants = bigleaf.constants()
)

e.to.rH(
  e,
  Tair,
  Esat.formula = c("Sonntag_1990", "Alduchov_1996", "Allen_1998"),
  constants = bigleaf.constants()
)

VPD.to.e(
  VPD,
  Tair,
  Esat.formula = c("Sonntag_1990", "Alduchov_1996", "Allen_1998"),
  constants = bigleaf.constants()
)

e.to.VPD(
  e,
  Tair,
  Esat.formula = c("Sonntag_1990", "Alduchov_1996", "Allen_1998"),
  constants = bigleaf.constants()
)

e.to.q(e, pressure, constants = bigleaf.constants())

q.to.e(q, pressure, constants = bigleaf.constants())

q.to.VPD(
  q,
  Tair,
  pressure,
  Esat.formula = c("Sonntag_1990", "Alduchov_1996", "Allen_1998"),
  constants = bigleaf.constants()
)

VPD.to.q(
  VPD,
  Tair,
  pressure,
  Esat.formula = c("Sonntag_1990", "Alduchov_1996", "Allen_1998"),
  constants = bigleaf.constants()
)

Arguments

VPD

Vapor pressure deficit (kPa)

Tair

Air temperature (deg C)

Esat.formula

Optional: formula to be used for the calculation of esat and the slope of esat. One of "Sonntag_1990" (Default), "Alduchov_1996", or "Allen_1998". See Esat.slope.

constants

eps - ratio of the molecular weight of water vapor to dry air (-)
Pa2kPa - conversion pascal (Pa) to kilopascal (kPa)

rH

Relative humidity (-)

e

Vapor pressure (kPa)

pressure

Atmospheric pressure (kPa)

q

Specific humidity (kg kg-1)

References

Foken, T, 2008: Micrometeorology. Springer, Berlin, Germany.